Refers to a traditional earthenware vessel, often used as a decanter for sake or other liquids. The reading へいし is less common.
In old liquor stores, sake in earthenware pots is lined up.
この瓶子は江戸時代のものだそうだ。
I heard this earthenware pot is from the Edo period.
Standard kanji spelling for this traditional vessel.
The kanji 瓶 means 'bottle' or 'jar' and 子 is a common suffix for small objects. The word likely originated from Chinese, referring to a small earthenware vessel.